Broken link to developer guide in open-developer-experience-kits/README.md

[evershalik]

The link to the developer guide in the documentation section of the open-developer-experience-kits/README.md is not working. Could you please fix the link so that users can easily access the developer guide?

Here is the broken link: https://smart-edge-open.github.io/docs/product-overview/
Fix it here: README.md